DATAREST-491 - Fixed handling of non-entity maps in JSON processing.

During our custom JSON handling on PUT requests, we previously piped all JSON objects through code that expected that one to be mapped to a PersistentEntity. This fails for JSON objects that basically represent maps.

We now skip that code paths for non-entity properties.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/json/DomainObjectReader.java

@@ -181,7 +181,7 @@ public class DomainObjectReader {
 				PersistentPropertyAccessor accessor = entity.getPropertyAccessor(target);
 				Object nested = accessor.getProperty(property);
 
-				if (nested != null) {
+				if (nested != null && property.isEntity()) {
 					doMerge((ObjectNode) child, nested, mapper);
 				}
 

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/mongodb/MongoWebTests.java

@@ -22,6 +22,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 
 import java.math.BigDecimal;
 import java.util.Arrays;
+import java.util.Collections;
 
 import org.junit.After;
 import org.junit.Before;
@@ -256,4 +257,21 @@ public class MongoWebTests extends CommonWebTests {
 				andExpect(status().isOk()).//
 				andExpect(jsonPath("$").exists());
 	}
+
+	/**
+	 * @see DATAREST-491
+	 */
+	@Test
+	public void updatesMapPropertyCorrectly() throws Exception {
+
+		Link profilesLink = client.discoverUnique("profiles");
+		Link profileLink = assertHasContentLinkWithRel("self", client.request(profilesLink));
+
+		Profile profile = new Profile();
+		profile.setMetadata(Collections.singletonMap("Key", "Value"));
+
+		putAndGet(profileLink, mapper.writeValueAsString(profile), MediaType.APPLICATION_JSON);
+
+		client.follow(profileLink).andExpect(jsonPath("$.metadata.Key").value("Value"));
+	}
 }

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/mongodb/Profile.java

@@ -1,6 +1,23 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.springframework.data.rest.webmvc.mongodb;
 
 import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.springframework.data.annotation.Id;
 import org.springframework.data.annotation.LastModifiedDate;
@@ -20,6 +37,7 @@ public class Profile {
 	private @JsonProperty(required = true) String type;
 	private @LastModifiedDate Date lastModifiedDate;
 	private @JsonProperty("renamed") String aliased;
+	private Map<String, String> metadata = new HashMap<String, String>();
 
 	public String getId() {
 		return id;
@@ -56,4 +74,12 @@ public class Profile {
 	public String getAliased() {
 		return aliased;
 	}
+
+	public Map<String, String> getMetadata() {
+		return metadata;
+	}
+
+	public void setMetadata(Map<String, String> metadata) {
+		this.metadata = metadata;
+	}
 }